| Abbreviation | Definition |
|---|---|
| NMDA | Network Management Datastore Architecture |
| NMDA | Nunzio Marc Desantis Architects |
| NOA | Network Of Architecture |
| NOA | Nomad Office Architects |
| NOAF | New Orleans Architecture Foundation |
| NORMA | Natural Object Role Modeling Architect |
| NOSA | NATO OSI Security Architecture |
| NOTA | Network on Terminal Architecture |
| NOWC | No Objection With Comments |
| NPA | Network Peripheral Architecture |
| NPS | Nominal Pipe Size |
| NPSM | National Pipe Straight Mechanical thread |
| NRE | Non-Recurring Engineering |
| NRRR | Non-Residential Remodeling and Renovation |
| NRV | Non Return Valve |
| NS | Near Side |
| NSAD | New School of Architecture and Design |
| NSF | Net Square Footage |
| NSF | Normal System Foundation |
| NSPE | National Society of Professional Engineers |